Questions? Looking for parts? Parts for sale? or just for a chat,
The WD Motorcycle forum
Definitely Cycle thread...5/16" dia. from memory...Ian
email (option): ian@wright52.plus.com
Thanks Ian, that's a relief; I have a 5/16 BSC tap. I had a nagging thought that it could be BSF or Whitworth. I hope the shell threads aren't too rough to save. Regards, Craig